When a user send an internal email through our Domino Server with a Banner or any images, the image which is displayed on the device is not the good one : it's a picture opened in a previous mail

After using the "Memory Cleaning" function, nothing better.

We have tried the 9800 with BES 4.1.6 : same problem.
We have tried a 9000 with BES 5.0.2 : no problem!
We sent about 30 mails with an Outlook Client configuring with Yahoo or Gmail on a 9800 activated on BES 5.0.2 : no problem!

So the problem seems to be between 9800 & Domino.
Someone has encountered this issue?